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Years after a devastating war between humans and monsters, a child has fallen through a hole and into the monsters' underground world. Under the care of a kindly monster woman named Toriel, they learn the basics of the underground world, including that they may be attacked by other monsters who are less friendly. After the child leave's Toriel's care, it's up to them how they proceed through the underground, including whether they kill the monsters in their way or try to find peaceful resolutions to conflict.

Undertale is an Eastern RPG with some action aspects in its combat system. In the overworld, the player explores areas, solves puzzles, and talks to NPCs. When a battle is triggered, typically through random encounter, the game switches to the combat screen. A heart representing the child's soul appears in a small box, in which objects representing the monsters' attacks appear and must be dodged in real time. On the child's turn, they can attack monsters more directly through the fight command. A meter that determines the strength of the player's attack must be hit with good timing in order to deal more damage.

Alternatively, players may choose to perform friendly actions in battle or show mercy to the opponent in order to resolve conflict without bloodshed. It is possible to finish every encounter in the game without killing anyone, though some monsters are more difficult to do this with than others. The player may need to perform certain actions in the overworld before some monsters can be befriended.

Although only one Undertale save file can be kept at a time, the game remembers certain player actions across playthroughs, mainly in reference to how violent or peaceful they were. Resetting to an earlier save or starting a new game after specific actions are taken can affect how some NPCs treat the player and how the story is ultimately resolved.


Undertale Windows Maybe trying to kill her just wasn't a good idea... you'll find out eventually.
Undertale Windows The sign from earlier meant what it said.
Undertale Windows Not really sure why this black eye came up, but hey, it's there.
Undertale Windows Take THAT, Martha Stewart!

Promo Images

Undertale Other Posted on July 3, 2013 to commemorate the project hitting the $25,000 stretch goal.
Undertale Other Posted on June 24, 2013 to commemorate the project hitting 200% of its initial funding goal.
Undertale Screenshot
Undertale Screenshot

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User Reviews

You'll laugh, you'll cry, and you might pet some dogs Windows Harmony♡ (19825)

Critic Reviews

IGN Windows Jan 12, 2016 10 out of 10 100
The Jimquisition Windows Sep 19, 2015 10 out of 10 100
IGN Macintosh Jan 12, 2016 10 out of 10 100
Vandal Online Windows Oct 03, 2015 9.8 out of 10 98
RPGFan Windows Oct 04, 2015 95 out of 100 95
Comics and Gaming Magazine / CGMagazine Windows Oct 05, 2015 9 out of 10 90 Windows Jan 02, 2016 9 out of 10 90 PlayStation 4 Sep 08, 2017 87 out of 100 87
New Game Network Windows Sep 28, 2015 87 out of 100 87
Kill Screen Windows Oct 13, 2015 65 out of 100 65


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Reused and Remixed Audio

Some songs and other audio clips in the game originated from other projects that lead developer Toby Fox has worked on. Perhaps most notably, the boss theme "Megalovania" was composed by Fox for an EarthBound ROM hack he made in his teens, and was later remixed for the webcomic Homestuck. Flowey's laughter also originated in the comic, where it was used for the character Caliborn. Lastly, the track "Fallen Down" was composed for I Miss You, a tribute album made using EarthBound's soundfont.

Sans and Papyrus Inspiration

Two of the game's major characters are Sans and Papyrus, a pair of skeletons named after the fonts their dialogue is rendered in. This is reminiscent of the webcomic Helvetica, in which the eponymous protagonist is a skeleton who shares his name with a font. The comic's author, J.N. Wiedle, is indeed listed in the credits as having provided inspiration for the characters.


  • The Dragon Awards – Best Science Fiction or Fantasy PC/Console Game (2016):
    • Nominated

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